Inelastic electron scattering, radiative width and magnetization density of the 2+, T = 1 state at 16.11 MeV in 12C

Electron scattering and charged pion photoproduction on12C and13C

“…Figure9 shows the electric quadrupole form factor [22, 27,28]. The theoretical curve is obtained by using the extended Siegert theorem in (3.7).…”

The Spectrum of 12C in a Multi-configuration Hartree-Fock Basis

“…Further, if the single particle elements, also given in Table 4, are used to estimate the isovector B(E2) value, strong cancellations occur and predictions then are very sensitive to details of the spectroscopy. As a consequence, our PHM calculation gave a value of O' 02 e 2 fm 4 for this isovector B(E2) value, whilst the naive model yielded a value of 5· 85 e 2 fm4; a value also predicted by an RPA calculation (Friebel et al 1978). The suppression of transition strength is further displayed in Fig.…”

Low energy spectrum and giant multipole resonances of12C (I)

“…These states are * To exhibit the characteristic of 12C spectrum and for sake of clarity we show in Fig. 4 for a given jr and T only states with small excitation energies [8]; obviously, they are very sensitive to details of the corresponding wave functions [21]. From an inspection of the model wave functions of the 1 + and 2 + states it follows, that the main component is the (lpt/2 lp3/2) (ph)-configuration (about 99~; see Table2) with small admixtures of (2h~o) components.…”

“…However, a unifying and comprehensive theoretical description of the nuclear structure of 12C over a large range of excitation energies within a large configuration space seems to be of actual interest. Only within such an extended model recent experimental data might be interpreted consistently -the radiative capture of protons with an energy around 100MeV to high lying states in 12C [20] shows a strong evidence for nuclear transitions between configurations with excitation energies of (i h~o) and (2h~o), a finding which is of significant importance for the extraction of high lying single particle states; -high-resolution electroexcitation experiments [21,22] to the 2 + states at 4.439MeV and 16.107MeV in ~2C have presented detailed information about the spatial distribution of nuclear convection and magnetization currents; -recent high-resolution inelastic pion scattering [23] at intermediate energies to many excited states in ~2C below 30 MeV has stimulated the interest on a detailed and consistent description of the ~2C spectrum; -a comparison of recent (e,e') data on low lying non-normal parity states in HB [24] with theoretical estimations [25] clearly maps out a large influence of the ls-hole component in the states involved.…”